Extended example: using multiple keys

Copy the source data below and paste it to a new spreadsheet:

	A	B	C	D
1	weight	height	age	name
2	10	5	6	foo
3	10	5	3	bar
4	15	10	8	baz
5	15	10	4	oaf
6	10	12	6	cool

In A7 cell, group by "weight", then by "age"

=GROUP_BY(FRAME(A1:D6), "weight", "age")

or (equivalent):

=GROUP_BY(FRAME(A1:D6), {"weight"; "age"})

Open the result in nested frame view. Observe and open grouped data in "by_{name}" columns.